iMac speed improvements

I’ve been annoyed at the laggardly behaviour of our iMac, currently running El Capitan, 10.11.6 . We’ve had the old girl for a few years now and I was sure that successive OS X upgrades had left some crud clogging it up – somewhere!

Even though I had cleaned up the Login Items for each user in System Preferences, I suspected there were other App “helpers” still running.

(Follow along if you want to try this at home).

Make sure you have a good backup.

Start up in Safe Mode (Hold <Shift> throughout startup).

Open a Finder window and go to Macintosh HD/Library/Launch Agents

In my case, I found these files:


com.adobe.ARMDCHelper.<a very long hex number>.plist

The first 2 related to Adobe Air and the Adobe Auto Updater. I thought I had deleted Adobe Air a long time ago but on further investigation I found it was still there! So I deleted it. I also deleted Adobe Acrobat reader because I no longer use it. I then deleted the .plist files. Of course, if you find similar files and you use Adobe Air or other Adobe products, you won’t want to delete them. Obviously your requirements will differ from mine.

The third file was more “interesting”. This is an auto update Daemon which Google uses to check for updates to products you have installed. In my case, the Chrome browser and NIK plug-ins. I decided to find out how often it “phones home”.

In Terminal, type:

defaults read and press <Return>

It spits out a lot of stuff about the Apps it checks, etc., ending with:

checkInterval = 18000;

Hmm. That’s every 5 hours. Overkill, I thought. So I changed the interval to once a week:

defaults write checkInterval 604800 <Return>

Of course, you could delete the daemon completely but I decided against that.

Lastly, I deleted the caches in Macintosh HD/Library/Caches, that’s  <File -> Select All> then <File -> Move to Trash>. I then did the same for each user in Macintosh HD/Users/<user name>/Library/Caches. This will remove any old, broken or corrupt caches which might be causing a problem. It is safe to delete the caches as OS X will create new ones the next time the user logs in.

Finally, I restarted the Mac (still in Safe Mode) and emptied each user’s Trash. Once that was completed, I restarted the Mac normally.